Array (params) C# Sharp Online

using System.IO;
using System;

class MyApp
{
    public int ArraySum (params int[] arr)
        {
            int sum=0;
            foreach (int i in arr)
            {
                sum+=i;
            }
            return sum;
        }
}    

class Execute
{
    static void Main()
    {
        MyApp app = new MyApp();
        int sum;
        int [] balance = {200,43,12,77,89};
        sum=app.ArraySum(balance);
        Console.WriteLine("Sum is {0}",sum);
    }
}